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1. (WO2018106103) IMPROVED SYSTEM WITH AN INFLATABLE MEMBER FOR BEING ARRANGED IN THE PATIENT'S RESPIRATORY TRACT
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Claims

1. A system with at least one inflatable member (7) configured for being arranged in a part of the patient's respiratory tract, comprising:

- a catheter (6) carrying the at least one inflatable member (7) to be arranged in the respiratory tract, said catheter comprising a fluid line (8) for filling the inflatable member with a fluid;

- a pressure monitoring and control member (24) to be arranged outside the patient's body, said pressure monitoring member being in fluid communication with the inflatable member and being configured to receive, during operation, fluid from the inflatable member when the pressure increases above a predetermined threshold pressure and to return said received fluid when the pressure decreases below said predetermined threshold pressure;

- wherein the pressure monitoring and control member is an elastically expandable balloon made from a material which is configured to expand elastically when the pressure in the balloon increases above a predetermined threshold pressure and to contract when the pressure decreases below said predetermined threshold pressure.

2. The system of claim 1, further comprising an imaging device, preferably an ultrasonic imaging device, configured to be arranged in or on the patient's body; wherein said fluid is an imaging liquid.

3. The system of claim 1, further comprising a trachea tube having a first end and a second end, wherein said first end is adapted for connection to a source of respiratory gas, said second end is adjacent to and attached around by the inflatable member.

4. The system of any one of the previous claim, wherein the volume of the elastically expandable balloon, in the non-expanded state, is at least 10 percent of the volume of the inflatable member.

5. The system of any one of the previous claims, wherein the material of the elastically expandable balloon is a thermoplastic elastomer, preferably a thermoplastic polyurethane elastomer.

6. The system of any one of the previous claims, wherein the durometer hardness of the material of the elastically expandable balloon, using test method ASTM D2240, is lower than the durometer hardness of the material of the inflatable member, more preferably at least 2A Shore lower, most preferably at least 5A Shore lower.

7. The system of any one of the previous claims, wherein the tensile modulus of the material of the elastically expandable balloon, wherein the ASTM D412 test method is used, is lower than the tensile modulus of the material of the inflatable member, more preferably at least 1 MPa lower at 50% elongation, and at least 2 MPa lower at 100% elongation.

8. The system of any one of the previous claims, wherein the predetermined threshold pressure lies in a range between 30 and 70 mm Hg.

9. The system of any one of the previous claims, wherein the volume of the elastically expandable balloon, in the non-expanded state, is between 2 and 10 ml, preferably between 2,5 and 6 ml.

10. The system of any one of the previous claims, wherein the expansion of the expandable balloon, when the pressure is above the predetermined threshold pressure, is essentially linear with respect to the pressure.

1 1. The system of any one of the previous claims, wherein the material of the inflatable member is a thermoplastic elastomer, preferably a thermoplastic polyurethane elastomer.

12. The system of any one of the previous claims, wherein the inflatable member, in the non-expanded state, has a volume between 20 ml and 60 ml, preferably between 30 ml and 50 ml.

13. The system of any one of the previous claims, further comprising positioning means for positioning the inflatable member at a predetermined location in the respiratory tract.

14. The system of the preceding claim, wherein the positioning means comprise guide means that are attached to or integrated with the flexible catheter.

15. The system of claim 14, wherein the guide means comprise a stylet arranged in the catheter and having a distal end at a tip of the catheter, said stylet extending beyond the inflatable member.

16. The system of any one of the previous claims, wherein the elastically expandable balloon has a thickness between 0.01 mm and 0.1 mm, preferably between 0.03 mm and 0.07 mm.