JPWO2020030776A5 - - Google Patents

Claims (15)

An intraluminal pressure sensing device comprising a flexible elongated member disposed within a body cavity of a patient, a housing coupled to the flexible elongated member, and a capacitive pressure sensor disposed within the housing. There is
the capacitive pressure sensor includes a substrate, a first active cell, and a second active cell;
The substrate of the capacitive pressure sensor includes a proximal portion coupled to the housing and a cantilever distal portion over which the cantilever distal portion is exposed to external pressure through an opening in the housing. wherein said first and second active cells are provided;
Intraluminal pressure sensing device. 2. The lumen of claim 1, further comprising an integrated circuit disposed on the cantilever distal portion of the substrate, the integrated circuit in communication with the first active cell and the second active cell. Internal pressure sensing device. further comprising first and second bond pads formed on the proximal portion of the substrate;
3. The intraluminal pressure sensing device of Claim 2, wherein the first and second bond pads are in communication with the integrated circuit. 4. The intraluminal pressure sensing device of Claim 3, further comprising first and second electrical conductors in communication with said first and second bond pads for transmitting measurement signals to a console. The integrated circuit is in communication with the first active cell and the second active cell, and the integrated circuit outputs an electrical signal representative of pressure sensed in the first active cell and the second active cell. 5. The intraluminal pressure sensing device of any one of claims 2-4, which outputs a . 6. The intraluminal pressure sensing device of any one of claims 1-5, further comprising a dummy cell formed on the proximal portion of the substrate, the dummy cell not providing an electrical signal representative of the external pressure. . 7. The intraluminal pressure sensing device of claim 6, wherein the dummy cell provides ultrasonic velocimetry and/or ultrasonic imaging signals. 8. The intraluminal pressure sensing device of claim 6 or 7, wherein the first active cell, the second active cell and the dummy cell are arranged longitudinally along the substrate. 9. A lumen according to any preceding claim, wherein the extent of overlap between the integrated circuit and the first active cell is approximately equal to the extent of overlap between the integrated circuit and the second active cell. Internal pressure sensing device. 8. The intraluminal pressure sensing device of any one of claims 1-7, wherein the first active cell and the second active cell are arranged symmetrically about the axis of the substrate. 11. The intraluminal pressure sensing device of any one of claims 1-10, wherein the proximal portion of the substrate has a first width and the distal portion has a second smaller width. 2. from claim 1, wherein said first and second active cells comprise a central pillar extending vertically from said substrate to a film, said first and second active cells being annularly formed around said central pillar. 12. The intraluminal pressure sensing device according to any one of clauses 11. 13. The intraluminal pressure sensing device of any one of claims 1-12, wherein the flexible elongated member comprises a guidewire or catheter. 6. The intraluminal pressure sensing device of Claim 5, wherein the integrated circuit outputs an electrical signal representing a ratio of pressures sensed at the first active cell and the second active cell. an intraluminal pressure sensing device according to any one of claims 1 to 14;
a console in communication with the capacitive pressure sensor, the console producing a value based on the electrical signal representing the external pressure and outputting a visual representation of the value to a display; pressure sensing system.