Ffr catheter with suspended pressure sensor and method of manufacture
AssigneeMedtronic Vascular, Inc.
InventorsGerry McCaffrey, Theresa Wittrock
Life of this patent
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Abstract
A catheter for measuring a pressure distal of a stenosis includes a shaft including a housing in a distal portion of the shaft. A flexible printed circuit board is coupled to the housing. A pressure sensor is coupled to the flexible printed circuit board and is suspended within the housing. An aperture enables blood flow into the housing and into contact with the pressure sensor.
Claims20
A catheter for measuring a pressure distal of a stenosis, the catheter comprising:
- a shaft including a housing in a distal portion of the shaft;
- a flexible printed circuit board coupled to the housing;
- a pressure sensor coupled to the flexible printed circuit board and suspended within the housing;
- and
- an aperture configured to allow blood flow into the housing and into contact with the pressure sensor.
A system for calculating a Fractional Flow Reserve of a stenosis in a blood vessel, the system comprising:
- a catheter including a shaft with a housing in a distal portion of the shaft;
- a distal pressure sensor suspended within the housing;
- an aperture configured to provide blood flow to the distal pressure sensor suspended within the housing;
- a proximal pressure-sensing device configured to measure a proximal blood pressure proximal of the stenosis;
- and
- a processing device in communication the distal pressure sensor and the proximal pressure-sensing device,
- wherein catheter is configured for placement within a blood vessel such that the housing is distal of the stenosis and blood distal of the stenosis flows through the aperture into the housing and in contact with the distal pressure sensor such that the distal pressure sensor measures a distal blood pressure distal of the stenosis, and
- wherein the processing device is configured to calculate the Fractional Flow Reserve based on the distal blood pressure relative to the proximal blood pressure.
A system for calculating a Fractional Flow Reserve of a stenosis in a blood vessel, the system comprising:
- a guidewire including a housing in a distal portion of the guidewire;
- a distal pressure sensor suspended within the housing;
- an aperture configured to provide blood flow to the distal pressure sensor suspended within the housing;
- a proximal pressure-sensing device configured to measure a proximal blood pressure proximal of the stenosis;
- and
- a processing device in communication the distal pressure sensor and the proximal pressure-sensing device,
- wherein guidewire is configured for placement within a blood vessel such that the housing is distal of the stenosis and blood distal of the stenosis flows through the aperture into the housing and in contact with the distal pressure sensor such that the distal pressure sensor measures a blood pressure distal of the stenosis, and
- wherein the processing device is configured to calculate the Fractional Flow Reserve based on the distal blood pressure relative to the proximal blood pressure
A method of manufacturing an FFR catheter, the method comprising the steps of:
- forming a shaft including a housing in a distal portion of a shaft, a guidewire lumen, and a sensor lumen;
- forming an open seat in the housing;
- coupling a pressure sensor to a flexible printed circuit board and to a sensor trace of the flexible printed circuit board;
- and
- positioning the flexible printed circuit board within the sensor lumen such that the pressure sensor coupled to the flexible printed circuit board is suspended within the open seat of the housing.
Dependencies are inferred from the claim text.