Intra-aortic balloon catheter having a dual sensor pressure sensing system
A balloon catheter has a balloon membrane, a tip connected to the distal end of the balloon membrane and an outer tube connected to the proximal end of the balloon membrane for supplying a medium for inflating and deflating the balloon membrane. A pressure sensor, such as a fiber optic sensor, may be mounted in a pocket in the tip. The pocket may be filled with a flexible substance which both communicates pressure to and protects the pressure sensor. A membrane may overlie the pocket to prevent leakage of the flexible substance therefrom.
1. A balloon catheter system, comprising:
a balloon catheter including a balloon membrane, a tip, a proximal fitting and an outer tube, a distal end of the balloon membrane being connected to the tip, and a proximal end of the outer tube being connected to the proximal fitting;
a fluid-filled pressure measurement system including a fluid source connected to the proximal fitting via a fluid source line, and a pressure sensor for measuring pressure in the fluid source line; and
a catheter pressure sensor connected to the balloon catheter.
2. The balloon catheter system as claimed in claim 1 , wherein the catheter pressure sensor comprises a transducer.
3. A balloon catheter system, comprising:
a balloon membrane;
a conduit connected to a proximal end of the balloon membrane;
a tip connected to a distal end of the balloon membrane, the tip having a pocket therein;
a pressure sensor mounted to the tip within the pocket; and
a protective material overlying the pressure sensor, the protective material being selected from the group consisting of a gel, a fluid and a gas.
4. The balloon catheter system as claimed in claim 3 , wherein the pocket is exposed to an exterior of the tip.
5. The balloon catheter system as claimed in claim 3 , wherein the pressure sensor includes a fiber optic sensor.
6. The balloon catheter system as claimed in claim 3 , further comprising a membrane overlying the pocket in the tip.
7. The balloon catheter system as claimed in claim 6 , wherein the membrane is the balloon membrane.
8. A balloon catheter system, comprising:
a balloon catheter including a balloon membrane, a tip, a proximal fitting and an outer tube, a distal end of the balloon membrane being connected to the tip, and a proximal end of the outer tube being connected to the proximal fitting;
a measurement system adapted to be fluid-filled, the measurement system being connectable to a fluid source and the proximal fitting via a fluid source line, and being connectable to a first pressure sensor for measuring pressure in the fluid source line; and
a second pressure sensor connected to the balloon catheter, the second pressure sensor including a fiber optic sensor.
9. The balloon catheter system as claimed in claim 8 , wherein the second pressure sensor is adapted to measure the pressure of fluid within a blood vessel.
10. The balloon catheter system as claimed in claim 8 , wherein the second pressure sensor is connected to the tip.
11. The balloon catheter system as claimed in claim 8 , wherein the tip comprises a tip lumen, an outer surface, and a pocket in the outer surface, and wherein the second pressure sensor is mounted to the tip with at least one surface of the second pressure sensor exposed in the pocket.
12. The balloon catheter system as claimed in claim 11 , wherein the pocket is filled with a protective material.
13. The balloon catheter system as claimed in claim 12 , wherein the protective material is a flexible substance.
14. The balloon catheter system as claimed in claim 13 , wherein the flexible substance is selected from the group consisting of gels, fluids, gases and elastomers.