Switch apparatus and method for switching between multiple electrodes for diagnostic and therapeutic procedures

• US 5,540,722 A
• Filed: 05/16/1994
• Issued: 07/30/1996
• Est. Priority Date: 05/16/1994
• Status: Expired due to Fees

• Current Assignee: Physiometrix, Inc. (Pfizer Inc.)
• Original Assignee: Physiometrix, Inc. (Pfizer Inc.)
• Inventors: Clare, Christopher R., Imran, Mir A.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/243,229
• Time in Patent Office: 806 Days
• Field of Search: 606/32, 606/36, 128/679, 128/695, 128/696, 128/709, 607/2, 607/115, 607/148, 607/5
• US Class Current: 607/5
• CPC Class Codes: A61B 18/12 by passing a current through the tissue to be heated, e.g. high-frequency current
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/16 Indifferent or passive electrodes for grounding
• CPC Class Codes: A61B 2018/00178 Electrical connectors
• CPC Class Codes: A61B 2018/0066 without feedback, i.e. open loop control
• CPC Class Codes: A61N 1/40 Applying electric fields by inductive or capacitive coupling microwave apparatus A61N5/00; Applying radio-frequency signals

Abstract

A switch apparatus for performing diagnostic and/or therapeutic procedures on a patient by the use of first and second electrodes adapted to be placed on the patient and by the use of a defibrillator unit and another medical device utilizing radiofrequency energy from a radiofrequency generator unit comprising a multi-function adapter unit adapted to be coupled to the first and second electrodes and adapted to be coupled to the defibrillator unit and to the electrosurgery unit for switching between the defibrillation unit and another medical device to permit performing the diagnostic and therapeutic procedures on the patient utilizing the same first and second electrodes.

Claims

1. Apparatus for performing diagnostic and/or therapeutic procedures on a patient comprising first and second electrodes adapted to be placed on the patient, a radio frequency generator unit, a defibrillator unit and another medical device utilizing radio frequency energy supplied by the radio frequency generator unit, a multi-function adapter unit coupled to the first and second electrodes and coupled to the defibrillator unit and to the another medical device, said multi-function adapter unit including means for detecting the presence of radio frequency energy from the radio frequency generator unit for automatically switching between the defibrillation unit and the another medical device to permit performing the diagnostic and therapeutic procedures on the patient utilizing the same first and second electrodes.

2. A switch apparatus in claim 1 wherein said multi-function adapter unit includes means for using both of said first and second electrodes as return electrodes when performing a procedure using said another medical device.

3. A switch apparatus for performing diagnostic and/or therapeutic procedures on a patient by the use of first and second electrodes adapted to be placed on the patient and by a use of a defibrillator unit and another medical device utilizing radio frequency energy supplied by a radio frequency generator unit comprising a multi-function adapter unit adapted to be coupled to the first and second electrodes and adapted to be coupled to the defibrillator unit and to the another medical device for switching between the defibrillation unit and the another medical device to permit performing the diagnostic and therapeutic procedures on the patient utilizing the same first and second electrodes, said multi-function adapter unit including means for sensing when radio frequency energy from the radio frequency generator unit is present.

4. A switch apparatus for performing diagnostic and/or therapeutic procedures on a patient by the use of first and second electrodes adapted to be placed on the patient and by a use of a defibrillator unit and another medical device utilizing radio frequency energy supplied by a radio frequency generator unit comprising a multi-function adapter unit adapted to be coupled to the first and second electrodes and adapted to be coupled to the defibrillator unit and to the another medical device for automatically switching between the defibrillation unit and the another medical device to permit performing the diagnostic and therapeutic procedures on the patient utilizing the same first and second electrodes, said multi-function adapter unit including a first relay for switching between the defibrillator unit and the another surgical device.

5. A switch apparatus as in claim 4 wherein said multi-function adapter unit includes an actuator circuit for sensing the presence or absence of radio frequency energy from the radio frequency generator unit, means connected to the actuator circuit for supplying a radio frequency dummy load to the radio frequency generator unit during the time when the first relay is being switched from the defibrillator unit to the another medical device to prevent the radio frequency generator unit from sensing at any time the absence of an RF signal.

6. A switch apparatus as in claim 4 further including an indicator unit coupled to the multi-function adapter unit, said indicator unit having first and second light indicating means, means for energizing the first light indicating means when the defibrillator unit is being used and means for energizing the second light indicating means when the another medical device is being used.

7. A switch apparatus as in claim 6 wherein said indicator unit is connected to said multi-function adapter unit solely by first and second conductors.

8. A switch apparatus as in claim 6 wherein said indicator unit includes a second relay and an actuator circuit connected to the second relay, means connected to the actuator circuit for ascertaining when radio frequency energy is being supplied to the actuator circuit, said second relay including means for supplying a dummy load to the radio frequency generator unit when the first relay is operated.

9. A switch apparatus as in claim 8 wherein the multi-function adapter unit includes a plurality of resistors adapted to be coupled to the first and second electrodes to help to establish a substantially uniform current distribution from the electrodes into the patient.

10. A switch apparatus as in claim 8 wherein said indicator unit includes means for connecting the electrodes to the defibrillator whenever radio frequency energy is not being used.

11. A switch apparatus as in claim 8 wherein said indicator unit includes fail-safe means for detecting a fault condition and for connecting the electrodes to the defibrillator unit when a fault condition occurs.

12. A method for performing diagnostic and therapeutic procedures on a patient by utilization of first and second electrodes adapted to be placed on a body of a patient and by the use of a defibrillator unit and another medical device utilizing radio frequency energy from a radio frequency generator unit comprising connecting the another medical device to the first and second electrodes, ascertaining the absence of radio frequency energy from the radio frequency generator unit and connecting the first and second electrodes to the defibrillator unit when the absence of radio frequency energy is sensed and at the same time disconnecting the electrodes from another medical device.

13. A method as in claim 12 together with the step of sensing a fault condition and connecting the first and second electrodes to the defibrillator when the fault condition is sensed.

14. A method as in claim 12 together with the step of connecting a radio frequency dummy load to the radio frequency generator unit when switching from the defibrillator unit to the another medical device.

15. A method as in claim 12 wherein the same first and second electrodes are used by the defibrillator unit and the another medical device.