Method of detecting surgical events

• US 20050209561A1
• Filed: 04/05/2004
• Published: 09/22/2005
• Est. Priority Date: 03/22/2004
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Alcon Incorporated
• Inventors: Gordon, Raphael, Morgan, Michael D.
• Granted Patent: US 7,297,137 B2
• Time in Patent Office: Days
• US Class Current: 604/119
• CPC Class Codes: A61F 9/00745 using mechanical vibrations, e.g. ultrasonic
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463

Abstract

A surgical system that is able to sense the onset of an occlusion or other surgical event as well as the instant an occlusion breaks.

Claims

1. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuums in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums;

e) establishing a match between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums based on the linear correlation;

f) detecting an occurrence of a surgical event based upong the establishment of the match between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums; and

g) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

2. The method of claim 1 wherein the linear correlation between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums is calculated using the following formula:

3. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuums and at least one a rate of change of aspiration vacuum in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums;

e) establishing a match between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums based on the linear correlation;

f) comparing a rate of change in the monitored aspiration vacuum to the rate of change of aspiration vacuum stored in the surgical system memory;

g) detecting an occurrence of a surgical event based upon the established match between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums and the comparison of the rate of change in the monitored aspiration vacuum to the rate of change of aspiration vacuum stored in the surgical system memory; and

h) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

4. A method of claim 3 wherein the linear correlation between the monitored aspiration vacuum and the pre-determined pattern of changes in aspiration vacuums is calculated using the following formula, where:

N—

correlation length (i.e. number of points in the sequences);

5. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of irrigation pressures in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the irrigation pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures;

e) establishing a match between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures based on the linear correlation;

f) detecting an occurrence of a surgical event based upong the establishment of the match between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures based on the linear correlation; and

g) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

6. The method of claim 5 wherein the linear correlation between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures is calculated using the following formula, where:

N—

correlation length (i.e. number of points in the sequences);

7. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of irrigation pressures in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration pressure and the pre-determined pattern of aspiration pressures;

e) establishing a match between the monitored aspiration pressure and the pre-determined pattern of aspiration pressures based on the linear correlation;

f) comparing the rate of change in the monitored irrigation pressure to the rate of change of irrigation pressure stored in the surgical system memory;

g) detecting an occurrence of a surgical event based upon the established match between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures and the comparison of the rate of change in the monitored irrigation pressure to the rate of change of irrigation pressure stored in the surgical system memory; and

h) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

8. The method of claim 7 wherein the linear correlation between the monitored irrigation pressure and the pre-determined pattern of irrigation pressure is calculated using the following formula, where:

N—

correlation length (i.e. number of points in the sequences);

9. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuum and irrigation pressure in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum and irrigation pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure;

e) establishing a match between the monitored aspiration vacuum and irrigation pressure and the pre-determined patterns of aspiration vacuum and irrigation pressure based on the linear correlation;

f) detecting an occurrence of a surgical event based upong the establishment of the match between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure based on the linear correlation; and

g) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

10. The method of claim 9 wherein the linear correlation between the monitored aspiration vacuum and irrigation pressure and the predetermined pattern of aspiration vacuum and irrigation pressure is calculated using the following formula:

11. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuum and irrigation pressure in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum and irrigation pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and irrigation pressure and the pre-determined patterns of aspiration vacuum and irrigation pressure;

e) establishing a match between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure based on the linear correlation;

f) comparing the rate of change in the monitored aspiration vacuum and irrigation pressure to the rate of change of aspiration vacuum and irrigation pressure stored in the surgical system memory;

g) detecting an occurrence of a surgical event based upon the established match between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure and the comparison of the rate of change in the monitored aspiration vacuum and irrigation pressure to the rate of change of aspiration vacuum and irrigation pressure stored in the surgical system memory; and

h) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

12. A method of claim 11 wherein the linear correlation between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure is calculated using the following formula:

13. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuums and at least one rate of change of aspiration vacuum in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums;

e) establishing a match between the monitored aspiration vacuum and the pre-determined pattern of aspiration vacuums based on the linear correlation;

f) calculating a linear correlation coefficient between the monitored aspiration vacuum and the pre-determined pattern of changes in aspiration vacuum;

g) comparing the calculated linear correlation coefficient to the rate of change of aspiration vacuums stored in the surgical system memory;

h) detecting an occurence of a surgical event based upon the established match between the monitored aspiration vacuum and the pre-determined pattern of of the aspiration vacuums and the comparison of the calculated linear correlation coefficient to the rate of change of aspiration vacuum stored in the surgical system memory; and

i) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

14. The method of claim 13 wherein the linear correlation coefficient between the monitored aspiration pressure and the pre-determined pattern of aspiration vacuums is calculated using the following formula:

15. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of irrigation pressures and at least one a rate of change of irrigation pressure in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the irrigation pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures;

e) establishing a match between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures based on the linear correlation;

f) calculating a linear correlation coefficient between the monitored irrigation pressure and the pre-determined pattern of changes in irrigation pressure;

g) comparing the calculated linear correlation coefficient to the rate of change of irrigation pressures stored in the surgical system memory;

h) detecting an occurence of a surgical event based upon the established match between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures and the comparison of the calculated linear correlation coefficient to the rate of change of irrigation pressure stored in the surgical system memory; and

i) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

16. The method of claim 15 wherein the linear correlation coefficient between the monitored irrigation pressure and the pre-determined pattern of irrigation pressures is calculated using the following formula, where:

N—

correlation length (i.e. number of points in the sequences);

17. A method of controlling a surgical system, the surgical system having a memory, comprising the steps of:

a) storing at least one pre-determined pattern of aspiration vacuum and irrigation pressure and at least one rate of change of aspiration vacuum and irrigation pressure in the surgical system memory;

b) operating the surgical system to perform a surgical procedure;

c) monitoring the aspiration vacuum and irrigation pressure in the surgical system during the surgical procedure;

d) calculating a linear correlation between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure;

e) establishing a match between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure based on the linear correlation;

f) calculating a linear correlation coefficient between the monitored aspiration vacuum and irrigation pressures and the pre-determined pattern of changes in aspiration vacuum and irrigation pressure;

g) comparing the calculated linear correlation coefficient to the rate of change of aspiration vacuum and irrigation pressure stored in the surgical system memory;

h) detecting an occurence of a surgical event based upon the established match between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure and the comparison of the calculated linear correlation coefficient to the rate of change of aspiration vacuum and irrigation pressure stored in the surgical system memory; and

i) varying the operation of the surgical system based on the detection of the occurrence of the surgical event.

18. The method of claim 17 wherein the linear correlation coefficient between the monitored aspiration vacuum and irrigation pressure and the pre-determined pattern of aspiration vacuum and irrigation pressure is calculated using the following formula: