SURGICAL DEVICE INCLUDING SYSTEM FOR SENSING TISSUE PROPERTIES AND METHODS THEREOF

• US 20190320918A1
• Filed: 01/30/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Eschbach, Matthew
• Granted Patent: US 11,389,071 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/1114 of the digestive tract, e.g. bowels or oesophagus
• CPC Class Codes: A61B 17/132 Tourniquets sphygmomanometer A61B5/022
• CPC Class Codes: A61B 2017/00022 Sensing or detecting at the treatment site
• CPC Class Codes: A61B 2017/00026 Conductivity or impedance, e.g. of tissue
• CPC Class Codes: A61B 2017/00057 Light
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61B 2505/05 Surgical care
• CPC Class Codes: A61B 5/02141 Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits A61B5/02233, A61B5/0235 take precedence
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/02154 by optical transmission
• CPC Class Codes: A61B 5/02241 of small dimensions, e.g. adapted to fingers
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/0538 invasively, e.g. using a catheter
• CPC Class Codes: A61B 5/6885 Monitoring or controlling sensor contact pressure
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

The present disclosure relates to systems and methods of detecting a tissue property during a laparoscopic surgical procedure with a tissue property sensing device. The method may include positioning a sensing assembly disposed along a distal portion of a tissue property sensing device about target tissue in a body cavity, inflating a bladder to compress and occlude blood flow of the target tissue, sensing a pressure measurement of pressure in the bladder and a light amplitude measurement of light projected through the target tissue, and determining a systolic blood pressure of the target tissue based on the pressure measurement and the light amplitude measurement.

Claims

1. A method of detecting a tissue property during a laparoscopic surgical procedure with a tissue property sensing device, the method comprising:

positioning a sensing assembly disposed along a distal portion of a tissue property sensing device about target tissue in a body cavity;

inflating a bladder to compress and occlude blood flow of the target tissue;

sensing a pressure measurement of pressure in the bladder and a light amplitude measurement of light projected through the target tissue; and

determining a systolic blood pressure of the target tissue based on the pressure measurement and the light amplitude measurement.

2. The method of claim 1, wherein sensing includes sensing a plurality of pressure measurements and a corresponding plurality of light amplitude measurements taken at a plurality of times as pressure in the bladder is reduced.

3. The method of claim 2, further comprising determining whether the pressure in the bladder is less than or equal to a lower operational threshold.

4. The method of claim 2, wherein sensing includes waiting to sense the plurality of pressure measurements and the plurality of light amplitude measurements until the pressure in the bladder is less than or equal to an upper operational threshold.

5. The method of claim 3, further comprising:

determining a root mean square (RMS) of the plurality of light amplitude measurements; and

identifying a subset of light amplitude measurements corresponding to a pulse based on the RMS.

6. The method of claim 5, wherein the identified light amplitude measurements corresponding to the pulse have a value greater than the RMS multiplied by a signal-to-noise ratio (SNR).

7. The method of claim 6, further comprising determining a systolic blood pressure based on the pressure measurements associated with a first pulse exceeding a predetermined threshold associated with a systolic blood pressure range.

8. The method of claim 6, further comprising determining a diastolic blood pressure based on the pressure measurements associated with a last pulse falling below a predetermined threshold associated with a diastolic blood pressure range.

9. The method of claim 6, further comprising:

multiplying the RMS by the SNR to determine a noise threshold; and

disregarding the light amplitude measurements whose value is less than the noise threshold when identifying a subset of light amplitude measurements corresponding to the pulse.

10. The method of claim 9, further comprising determining a systolic blood pressure based on the pressure measurements associated with the pulse.

11. The method of claim 9, further comprising identifying a plurality of pulses.

12. The method of claim 11, further comprising determining a pulse rate based on the identified plurality of pulses.

13. The method of claim 11, further comprising determining a systolic blood pressure based on the pressure measurements associated with the plurality of pulses.

14. The method of claim 11, further comprising determining a diastolic blood pressure based on the pressure measurements associated with the plurality of pulses.

15. The method of claim 9, further comprising determining a systolic blood pressure based on the pressure measurements associated with a first pulse.

16. The method of claim 9, further comprising determining a diastolic blood pressure based on the pressure measurements associated with a last pulse.

17. The method of claim 1, further comprising identifying a systolic blood pressure based on the sensing,

wherein sensing includes sensing a first pressure measurement and a first light amplitude measurement taken at a first time, and a second pressure measurement and a second light amplitude measurement taken at a second time, the first light amplitude measurement being less than the second light amplitude measurement.

18. The method of claim 2, further comprising identifying a start point and a stop point of depressurization based on the plurality of pressure measurements.

19. The method of claim 18, further comprising identifying at least one pulse based on the plurality of light amplitude measurements.

20. The method of claim 18, further comprising identifying a plurality of pulses based on the plurality of light amplitude measurements.

21. The method of claim 20, further comprising identifying a systolic blood pressure based on the plurality of pulse measurements, the systolic blood pressure being the pressure measured at a first pulse from among the plurality of pulses.

22. The method of claim 20, further comprising identifying a peak light amplitude measurement based on the plurality of light amplitude measurements.

23. The method of claim 22, further comprising identifying a beginning of each pulse, wherein the beginning of each pulse occurs at the time where a light amplitude measurement is both greater than a previous light amplitude measurement and a light amplitude threshold, the light amplitude threshold calculated as the value of the peak light amplitude measurement multiplied by a predetermined value.

24. The method of claim 23, further comprising identifying a systolic blood pressure based on the pressure measurements associated with a first pulse.

25. The method of claim 24, further comprising identifying a diastolic blood pressure based on the pressure measurements associated with a last pulse.

26. The method of claim 25, further comprising:

calculating a root mean square (RMS) based on the plurality of light amplitude measurements; and

determining a noise threshold based on the RMS.

27. The method of claim 26, wherein determining the noise threshold includes setting the noise threshold as the RMS multiplied by a signal-to-noise ratio (SNR).

28. The method of claim 27, wherein the light amplitude measurements which are less than the noise threshold are determined to be noise signals not associated with a pulse.

29. The method of claim 28, further comprising transmitting an error signal when no pulse is detected.

30. The method of claim 28, further comprising transmitting a signal to display the systolic blood pressure.