Method and system for measuring pressure in a body cavity using a trocar

1. A method comprising:

positioning a portion of a trocar into a patient cavity, the trocar comprising an inner tubular member and an outer tubular member disposed about the inner tubular member;

inserting a surgical instrument into the inner tubular member of the trocar;

measuring, by a pressure sensor disposed within the inner tubular member of the trocar and being in direct pressure contact with the patient cavity, a pressure within the inner tubular member of the trocar, the measured pressure being indicative of a pressure in the patient cavity; and

supplying, based at least in part on the measured pressure, an insufflation gas to the patient cavity by providing the insufflation gas through the outer tubular member of the trocar.

2. The method of claim 1 , wherein the pressure sensor is disposed in a portion of the trocar that is not accessible by the surgical instrument.

3. The method of claim 2 , wherein a cross section of the inner tubular member is formed with a cutout region and the pressure sensor is disposed within the cutout region.

4. The method of claim 1 , wherein the pressure sensor is electrically connected to an insufflator for supplying the insufflation gas to the patient cavity, the electrical connection comprising a wire disposed at least partially within the inner tubular member of the trocar.

5. The method of claim 1 , and further comprising controlling the pressure in the patient cavity based on the pressure measured by the pressure sensor disposed in the trocar.

6. The method of claim 5 , wherein controlling the pressure in the patient cavity comprises maintaining a substantially constant pressure in the patient cavity.

7. The method of claim 1 , wherein the pressure sensor is electrically connected to an insufflator for supplying the insufflation gas to the patient cavity, the electrical connection comprising a wire disposed at least partially within the outer tubular member of the trocar.

8. The method of claim 1 , wherein the outer tubular member is formed with apertures in a side wall of the outer tubular member for allowing the insufflation case to flow into the patient cavity.

9. The method of claim 1 , wherein the inner tubular member is formed with apertures in a side wall of the inner tubular member for allowing insufflation gas to flow between the inner and outer tubular members.

10. A method comprising:

positioning a portion of a trocar into a patient cavity;

inserting a surgical instrument into the trocar;

measuring, by a pressure sensor disposed within the trocar and being in direct pressure contact with the patient cavity, a pressure within the trocar, the measured pressure being indicative of a pressure in the patient cavity; and

supplying, based at least in part on the measured pressure, an insufflation gas to the patient cavity by providing the insufflation gas through the trocar.

11. The method of claim 10 , wherein

the trocar comprises an inner tubular member and an outer tubular member disposed about the inner tubular member;

inserting the surgical instrument into the trocar comprises inserting the surgical instrument into the inner tubular member;

the pressure sensor is disposed in the inner tubular member of the trocar and measuring a pressure within the trocar comprises measuring a pressure within the inner tubular member; and

supplying the insufflation gas comprises supplying the insufflation gas through the outer tubular member.

12. The method of claim 11 , wherein the outer tubular member is formed with apertures in a side wall of the outer tubular member for allowing the insufflation case to flow into the patient cavity.

13. The method of claim 11 , wherein the inner tubular member is formed with apertures in a side wall of the inner tubular member for allowing insufflation gas to flow between the inner and outer tubular members.

14. The method of claim 10 , wherein the pressure sensor is disposed in a portion of the trocar that is not accessible by the surgical instrument.

15. The method of claim 10 , wherein

the trocar comprises an inner tubular member and an outer tubular member disposed about the inner tubular member; and

the pressure sensor is disposed in a portion of the inner tubular member that is not accessible by the surgical instrument.

16. The method of claim 15 , wherein a cross section of the inner tubular member is formed with a cutout region and the pressure sensor is disposed within the cutout region.

17. The method of claim 10 , wherein

the trocar comprises an inner tubular member and an outer tubular member disposed about the inner tubular member, the outer tubular member having at least a first chamber and a second chamber separated from the first chamber; and

the pressure sensor is disposed in the first chamber and the insufflation gas is supplied through the second chamber.

18. The method of claim 10 , wherein the pressure sensor is electrically connected to an insufflator for supplying the insufflation gas to the patient cavity, the electrical connection comprising a wire disposed at least partially within the trocar.

19. The method of claim 10 , and further comprising controlling the pressure in the patient cavity based on the pressure measured by the pressure sensor disposed in the trocar.

20. The method of claim 19 , wherein controlling the pressure in the patient cavity comprises maintaining a substantially constant pressure in the patient cavity.

21. A trocar assembly comprising:

an inner tubular member formed with an opening adapted to provide access for one or more surgical instruments during a surgical procedure;

an outer tubular member disposed about the inner tubular member; and

a pressure sensor disposed within the inner tubular member and configured to be in direct pressure contact with a patient cavity.

22. The trocar assembly of claim 21 , wherein the inner tubular member is formed with a cutout and the pressure sensor is disposed within the cutout of the inner tubular member.

23. The trocar assembly of claim 21 , and further comprising an electrical wire connected to the pressure sensor and extending to an insufflator.

24. The trocar assembly of claim 21 , wherein the electrical wire is disposed partially in the outer tubular member.

25. The trocar assembly of claim 21 , wherein the outer tubular member has at least a first chamber and a second chamber separated from the first chamber.

26. The trocar assembly of claim 21 , and further comprising the insufflator.

27. The trocar assembly of claim 21 , wherein the outer tubular member is formed with apertures in a side wall of the outer tubular member for allowing the insufflation case to flow into the patient cavity.

28. The trocar assembly of claim 21 , wherein the inner tubular member is formed with apertures in a side wall of the inner tubular member for allowing insufflation gas to flow between the inner and outer tubular members.