MICROCATHETER SENSOR DESIGN FOR MINIMIZING PROFILE AND IMPACT OF WIRE STRAIN ON SENSOR

摘要

A catheter, such as a fractional flow reserve catheter, includes an elongate shaft having a pressure sensing wire extending to the distal portion of the elongate shaft. The wire has a pressure sensor mounted on the distal end for measuring a pressure of a fluid within lumen of vessel. The pressure sensor wire is disposed within a pocket formed adjacent to the pressure sensor thereby minimizing the profile of the catheter. Bending stresses experienced by a pressure sensor mounted to a fractional flow reserve catheter when tracking the catheter through the vasculature creates a distortion of the sensor resulting in an incorrect pressure reading or bend error. In order to isolate the sensor from bending stresses, the sensor is spaced apart from the pressure sensor wire to allow the pressure sensor and the pressure sensor wire to move independently from one another.

主权项

1. A catheter comprising:
an elongate shaft including a proximal portion and a distal portion, the elongate shaft having a shaft wall, the shaft wall having an outer and inner surface, the shaft wall inner surface defining a guidewire lumen; and a pressure sensor is coupled to the shaft wall outer surface at the distal end of the elongate shaft, the sensor is coupled to shaft wall such that one end of sensor is spaced apart from the shaft wall and forms an overhang to define a pocket between the overhang and the shaft wall, wherein the pocket is configured to receive an electrical coupling member;