Surgical generator for ultrasonic and electrosurgical devices

• US 8,956,349 B2
• Filed: 10/01/2010
• Issued: 02/17/2015
• Est. Priority Date: 10/09/2009
• Status: Active Grant

• Current Assignee: Cilag Gmbh International (Johnson & Johnson)
• Original Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Inventors: Aldridge, Jeffrey L., Wiener, Eitan T.
• Primary Examiner(s): Stoklosa, Joseph
• Assistant Examiner(s): Ram, Jocelyn D
• Application Number:
  US12/896,479
• Publication Number:
  US 20110087216A1
• Time in Patent Office: 1,600 Days
• Field of Search: 606/34, 606/38, 606/42
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1233 with circuits for assuring patient safety
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 2017/00017 Electrical control of surgical instruments
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/00482 with a code
• CPC Class Codes: A61B 2017/00486 Adaptors for coupling parts with incompatible geometries
• CPC Class Codes: A61B 2017/2934 arcuate shaped guiding means
• CPC Class Codes: A61B 2017/2936 Pins in guiding slots
• CPC Class Codes: A61B 2017/320069 for ablating tissue
• CPC Class Codes: A61B 2017/320071 with articulating means for working tip
• CPC Class Codes: A61B 2017/320094 additional movable means performing clamping operation
• CPC Class Codes: A61B 2017/320095 with sealing or cauterizing means
• CPC Class Codes: A61B 2018/00178 Electrical connectors
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/0063 Sealing
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00678 upper
• CPC Class Codes: A61B 2018/00684 using lookup tables
• CPC Class Codes: A61B 2018/00702 : Power or energy
• CPC Class Codes: A61B 2018/0072 : Current
• CPC Class Codes: A61B 2018/00732 : Frequency
• CPC Class Codes: A61B 2018/00767 : Voltage
• CPC Class Codes: A61B 2018/00779 : Power or energy
• CPC Class Codes: A61B 2018/00803 : with temperature prediction
• CPC Class Codes: A61B 2018/00827 : Current
• CPC Class Codes: A61B 2018/00875 : Resistance or impedance
• CPC Class Codes: A61B 2018/00892 : Voltage
• CPC Class Codes: A61B 2018/00988 : Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter
• CPC Class Codes: A61B 2018/00994 : combining two or more different kinds of non-mechanical energy or combining one or more non-mechanical energies with ultrasound
• CPC Class Codes: H01R 2201/12 : for medicine and surgery
• CPC Class Codes: H10N 30/802 : Drive or control circuitry or methods for piezoelectric or electrostrictive devices not otherwise provided for

Abstract

In accordance with various embodiments, a surgical generator for providing a drive signal to a surgical device may comprise a first transformer and a second transformer. The first transformer may comprise a first primary winding and a first secondary winding. The second transformer may comprise a second primary winding and a second secondary winding. The surgical generator may further comprise a generator circuit to generate the drive signal. The generator circuit may be electrically coupled to the first primary winding to provide the drive signal across the first primary winding. The surgical generator may also comprise a patient-side circuit electrically isolated from the generator circuit. The patient-side circuit may be electrically coupled to the first secondary winding. Further, the patient-side circuit may comprise first and second output lines to provide the drive signal to the surgical device. In addition, the surgical generator may comprise a capacitor. The capacitor and the second secondary winding may be electrically coupled in series between the first output line and ground.

Claims

1. A surgical generator for providing a drive signal to a surgical device, the generator comprising:

a first transformer comprising a first primary winding and a first secondary winding;

a second transformer comprising a second primary winding and a second secondary winding;

a generator circuit to generate the drive signal, wherein the generator circuit is electrically coupled to the first primary winding to provide the drive signal across the first primary winding;

a patient-side circuit electrically isolated from the generator circuit, wherein the patient-side circuit is electrically coupled to the first secondary winding, and wherein the patient-side circuit comprises first and second output lines to provide the drive signal to the surgical device; and

a capacitor, wherein the capacitor and the second secondary winding are connected in series between the first output line and ground, and wherein the second primary winding is connected to the first primary winding in a manner such that an inverse of the drive signal appears across the second primary winding.

2. The surgical generator of claim 1, wherein the capacitor has a first electrode connected to the first output line and a second electrode connected to the second secondary winding.

3. The surgical generator of claim 2, wherein the second secondary winding comprises a first electrode connected to the second electrode of the capacitor and a second electrode connected to ground.

4. The surgical generator of claim 3, further comprising a load resistor connected in parallel with the second secondary winding, wherein the load resistor has a first electrode connected to the first electrode of the second secondary winding and a second electrode connected to the second electrode of the second secondary winding.

5. The surgical generator of claim 1, wherein the second secondary winding comprises a first electrode connected to the first output line and a second electrode connected to the capacitor.

6. The surgical generator of claim 5, wherein the capacitor comprises a first electrode connected to the second electrode of the second secondary winding and a second electrode connected to ground.

7. The surgical generator of claim 1, wherein the capacitor is a Y-type capacitor.

8. The surgical generator of claim 1, further comprising a load resistor connected in parallel with the second secondary winding, wherein a polarity of the second secondary winding relative to second primary winding is opposite of a polarity of the first secondary winding relative to the first primary winding.

9. A surgical generator for providing a drive signal to a surgical device, the generator comprising:

a first transformer comprising a primary winding, a first secondary winding, and a second secondary winding, wherein a polarity of the first secondary winding relative to the primary winding is opposite the polarity of the second secondary winding;

a generator circuit to generate the drive signal, wherein the generator circuit is electrically coupled to the primary winding to provide the drive signal across the primary winding;

a patient-side circuit electrically isolated from the generator circuit, wherein the patient-side circuit is electrically coupled to the first secondary winding, and wherein the patient-side circuit comprises first and second output lines to provide the drive signal to the surgical device; and

a capacitor, wherein the capacitor and second secondary winding are connected in series between the first output line and ground.

10. The surgical generator of claim 9, wherein the capacitor has a first electrode connected to the first output line and a second electrode connected to the second secondary winding.

11. The surgical generator of claim 10, wherein the second secondary winding comprises a first electrode connected to the second electrode of the capacitor and a second electrode connected to ground.

12. The surgical generator of claim 11, further comprising a load resistor connected in parallel with the second secondary winding, wherein the load resistor has a first electrode connected to the first electrode of the second secondary winding and a second electrode connected to the second electrode of the second secondary winding.

13. The surgical generator of claim 9, wherein the second secondary winding comprises a first electrode connected to the first output line and a second electrode connected to the capacitor.

14. The surgical generator of claim 13, wherein the capacitor comprises a first electrode connected to the second electrode of the second secondary winding and a second electrode connected to ground.

15. The surgical generator of claim 9, wherein the capacitor is a Y-type capacitor.

16. A surgical generator for providing a drive signal to a surgical device, the generator comprising:

a first transformer comprising a primary winding and a secondary winding;

a generator circuit to generate the drive signal, wherein the generator circuit is electrically coupled to the primary winding to provide the drive signal across the primary winding;

a patient-side circuit electrically isolated from the generator circuit, wherein the patient-side circuit is connected to the secondary winding, and wherein the patient-side circuit comprises first and second output lines to provide the drive signal to the surgical device;

a capacitor, wherein the capacitor and is connected to the primary winding and to the first output line;

a correction circuit connected in series between the capacitor and ground; and

a correction control circuit, wherein the correction control circuit is programmed to;

receive an input describing the drive signal;

calculate a correction signal based on the input describing the drive signal; and

provide the correction signal to the correction circuit.

17. The surgical generator of claim 16, wherein the capacitor is a Y-type capacitor.

18. The surgical generator of claim 16, wherein the correction control circuit comprises:

at least one processor;

at least one analog-to-digital converter to convert the input to digital; and

at least one digital-to-analog converter to convert the correction signal to analog.

19. A surgical generator for providing a drive signal to a surgical device, the generator comprising:

a first transformer comprising a primary winding and a secondary winding;

a generator circuit to generate the drive signal, wherein the generator circuit is electrically coupled to the primary winding to provide the drive signal across the primary winding;

a patient-side circuit electrically isolated from the generator circuit, wherein the patient-side circuit is electrically coupled to the secondary winding, and wherein the patient-side circuit comprises first and second output lines to provide the drive signal to the surgical device;

a first capacitor, wherein a first electrode of the first capacitor is connected to the primary winding;

a second capacitor, wherein a first electrode of the second capacitor is connected to the first output line and a second electrode of the second capacitor is connected to a second electrode of the first capacitor; and

a third capacitor, wherein a first electrode of the third capacitor is connected to the second electrode of the first capacitor and the second electrode of the second capacitor, and wherein a second electrode of the third capacitor is connected to ground.

20. The surgical generator of claim 19, wherein the second capacitor is a Y-type capacitor.