Pressure sensor calibration systems and methods
Intravascular devices, systems, and methods are disclosed. In some embodiments, the intravascular devices include at least one pressure sensing component within a distal portion of the device. In that regard, one or more electrical, electronic, optical, and/or electro-optical pressure-sensing components is secured to an elongated member and the system includes components to process the output signals according to various calibration parameters.
1. An intravascular sensor assembly, comprising:
a flexible elongate member comprising:
a proximal connection portion configured to be positioned outside a patient body and adapted for coupling to a signal processing system via a patient interface module (PIM) communicatively positioned between the flexible elongate member and the signal processing system, and
an intravascular sensor disposed adjacent a distal end of the flexible elongate member and configured to be positioned within the patient body,
wherein the proximal connection portion comprises a cable and a connector at a proximal portion of the cable, the connector comprising a connector housing;
a memory component disposed within the connector housing of the connector and storing one or more calibration coefficients for the intravascular sensor; and
a processor disposed within the connector housing of the connector, the processor configured to:
receive sensor signals from the intravascular sensor;
read the one or more calibration coefficients from the memory component in response to communication by the PIM;
calibrate the sensor signals based on the one or more calibration coefficients such that the sensor signals are calibrated within the flexible elongate member during use of the intravascular sensor assembly; and
output calibrated sensor signals from the connector to the PIM.
2. The assembly of claim 1 , wherein the memory component comprises an analog read only memory.
3. The assembly of claim 2 , wherein the memory component comprises resistors.
4. The assembly of claim 2 , wherein the processor comprises an analog to digital converter and a multiplexer.
5. The assembly of claim 4 , wherein the processor further comprises an I2C interface.
6. The assembly of claim 1 , wherein the PIM comprises a second cable disposed between the connector housing and the signal processing system.
7. The assembly of claim 1 , wherein the connector housing is configured to connect to a second connector of the PIM.
8. An intravascular sensing system, comprising:
a flexible elongate member comprising:
a proximal connection portion configured to be positioned outside a patient body, the proximal connection portion comprising a cable and a connector at a proximal portion of the cable, wherein a memory component storing one or more calibration coefficients for the intravascular sensing system and a processor are disposed within a connector housing of the connector; and
as intravascular sensor disposed adjacent a distal end of the flexible elongate member and configured to be positioned within the patient body; and
a patient interface module (PIM) separate from the flexible elongate member, the PIM adapted for coupling the proximal connection portion to a signal processing system, wherein the processor is configured to:
receive sensor signals from the intravascular sensor;
read the one or more calibration coefficients from the memory component in response to communication by the PIM;
calibrate the sensor signals based on the one or more calibration coefficients such that the sensor signals are calibrated within the flexible elongate member during use of the intravascular sensing system; and
output calibrated sensor signals from the connector to the PIM, and wherein the PIM is configured to receive the calibrated sensor signals output by the connector.