Method and system for optically detecting blood and controlling a generator during electrosurgery

• US 7,749,217 B2
• Filed: 05/06/2003
• Issued: 07/06/2010
• Est. Priority Date: 05/06/2002
• Status: Expired due to Fees

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Podhajsky, Ronald J.
• Primary Examiner(s): Peffley; Michael
• Application Number:
  US10/513,764
• Publication Number:
  US 20060025760A1
• Time in Patent Office: 2,618 Days
• Field of Search: 606 32- 34, 606 40- 42, 606 45- 52, 606 7- 15, 600473-480
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2017/00057 Light
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 5/0071 by measuring fluorescence emission
• CPC Class Codes: A61B 5/0075 by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy A61B5/0071 takes precedence
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence
• CPC Class Codes: A61B 5/0086 using infrared radiation
• CPC Class Codes: A61B 5/02042 Determining blood loss or bleeding, e.g. during a surgical procedure

Abstract

A method and electrosurgical system for optically detecting blood and controlling an electrosurgical generator are provided. An optical blood detection system is used for optically detecting blood and may be included as an integral part of the overall electrosurgical system'"'"'s circuitry, or may be designed as a separate unit that connects to, and controls, an electrosurgical generator. The optical blood detection system may be embodied through a variety of analog, digital and/or optical circuit components or arrangements, including software running on computational and memory circuitry. The optical blood detection system controls the output mode and energy of the electrosurgical generator in accordance with the amount of blood detected.

Claims

1. An electrosurgical system comprising:

means for generating and directing broadband light energy of two different wavelengths onto tissue;

means for generating electrosurgical energy and transmitting the same via an electrode to the tissue;

means for capturing and analyzing characteristics of reflected broadband light energy and utilizing a ratio therebetween to determining an amount of blood present in proximity to the electrode and for controlling the means for generating electrosurgical energy accordingly; and

means for selecting a first control mode when the ratio value is below the predetermined threshold value and a second control mode when the ratio value is above a predetermined threshold value.

2. The electrosurgical system of claim 1, wherein the means for generating and directing broadband light energy of two different wavelengths generates light energy in at least one of the visible, near-infrared and infrared light spectrum wavelengths.

3. The electrosurgical system of claim 1, wherein the means for generating electrosurgical energy generates electrosurgical energy having at least one of a tissue division and a coagulation output waveform.

4. The electrosurgical system of claim 1, wherein the reflected broadband light energy characteristics are selected from the group consisting of light intensity level, light scattering effects, and level of fluorescent energy.

5. The electrosurgical system of claim 1, wherein the means for capturing and analyzing is remotely located from the means for generating broadband light energy and the means for generating electrosurgical energy.

6. The electrosurgical system of claim 1, wherein the means for capturing and analyzing analyzes reflected broadband light energy characteristics using a technique selected from the group consisting of Near Infrared Spectroscopy, Infrared Spectroscopy, Fluorescence Spectroscopy, Raman Spectroscopy, Photoacoustic Spectroscopy, laser Doppler flowmetry, measurement of light scatter changes, and measurement of polarization changes.

7. The electrosurgical system of claim 1, wherein the broadband light energy has at least one wavelength suitable for creating an ionized pathway between a distal end of the electrode and the tissue, and the electrode is positioned near the ionized pathway such that the electrosurgical energy is conducted along the ionized pathway.

8. The electrosurgical system of claim 1, wherein the means for capturing and analyzing includes means for detecting the presence of at least one blood vessel in proximity to a distal end of the electrode.

9. The electrosurgical system of claim 1, wherein the means for capturing and analyzing reflected characteristics of the light energy includes means for determining the ratio value by dividing a first parameter obtained by directing light energy having a first wavelength from a second parameter obtained by directing light energy having a second wavelength.

10. The electrosurgical system of claim 9, wherein the means for capturing and analyzing reflected characteristics of the light energy further includes means for determining whether the ratio value is at least one of lower than, approximately equal to, and greater than a predetermined ratio value and for controlling the means for generating electrosurgical energy accordingly.

11. The electrosurgical system of claim 9, wherein the first wavelength is in the range of about 620 to about 700 nanometers and the second wavelength is in the range of about 950 to about 1050 nanometers.

12. The electrosurgical system of claim 1, wherein the means for controlling the source of electrosurgical energy includes means for variably controlling the intensity of the current generated by the electrosurgical generator.

13. A method for performing electrosurgery, the method comprising the steps of:

supplying broadband light energy having at least two different wavelengths and electrosurgical energy to tissue via at least one instrument having a distal end;

capturing and analyzing reflected characteristics of the broadband light energy utilizing a ratio value between the reflected characteristics of the two wavelengths to determine an amount of blood present in proximity to the at least one instrument and for controlling the delivery of electrosurgical energy accordingly;

comparing the ratio value with a predetermined ratio value to control the amount of electrosurgical energy and to select at least one control mode of the source of electrosurgical energy accordingly; and

selecting a first control mode when the ratio value is below a predetermined threshold and a second control mode when the ratio value is above a predetermined threshold.

14. The method of claim 13, wherein the step of capturing and analyzing reflected characteristics of the broadband light energy includes the step of using a technique selected from the group consisting of Near Infrared Spectroscopy, Infrared Spectroscopy, Fluorescence Spectroscopy, Raman Spectroscopy, Photoacoustic Spectroscopy, laser Doppler flowmetry, measurement of light scatter changes, and measurement of polarization changes.

15. The method of claim 13, further comprising the step of sequencing the delivery of broadband light energy and electrosurgical energy from the distal end for first creating an ionized pathway between the distal end and the tissue, and conducting electrosurgical energy along the ionized pathway.

16. The method of claim 13, wherein the analyzing step further includes the step determining the presence of at least one blood vessel in proximity to the at least one instrument.

17. The method of claim 13, wherein the step of capturing and analyzing reflected characteristics of the broadband light energy includes the step of determining the ratio value by dividing a first parameter obtained by supplying light energy having a first wavelength from a second parameter obtained by supplying light energy having a second wavelength.

18. The method of claim 17, wherein the step of capturing and analyzing reflected characteristics of the broadband light energy further includes the step of determining whether the ratio value is at least one of lower than, approximately equal to, and greater than a predetermined ratio value.

19. The method of claim 17, wherein the first wavelength is in the range of about 620 to about 700 nanometers and the second wavelength is in the range of about 950 to about 1050 nanometers.

20. The method of claim 13, wherein the step of capturing and analyzing reflected characteristics of the light energy includes the step of variably controlling the intensity of the current generated by the electrosurgical generator.