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Solid-State Sensors vs. Fluid-Filled Transducers
Accurate detection of blood pressure is perhaps the most crucial parameter in any study requiring an indication of cardiac function. In the research laboratory, pressure measurement techniques fall under two broad classifications: direct and indirect methods. Indirect methods, such as the Cuff Technique can be used to measure systemic blood pressure; however, these methods are approximate and cannot detect diastolic pressures accurately.
Direct pressure sensing devices offer a precise and meaningful measure of blood pressure and, as the name suggests, are able to detect pressure at the source. These devices are typically inserted (as part of a catheter) through the carotid artery or femoral artery until the sensor is located in the region of interest such as the ventricle or aorta. Solid state sensors, available from Scisense, are mounted at the tip of the catheter and measure pressure precisely and with a high degree of frequency response directly at this location. Alternatively, fluid-filled transducers rely on a liquid-filled tube to transmit pressure from the region of interest back to an external pressure sensor.
The Scisense Advantage:
The figures below show the difference in quality and accuracy of pressure detection between a Scisense solid state sensor and a conventional* fluid-filled sensor. Notice that the fluid-filled transducer is unable to accurately detect changes in pressure at higher frequencies. The signal becomes grossly distorted at a frequency of 5 Hz (approximately 300 BPM) and unrecognizable at 10 Hz and 15 Hz. In addition to measuring precise and noise-free pressure signals, solid-state transducers allow for accurate detection and calculation of dP/dt, considered to be one of the most fundamental indices of cardiac function.
Furthermore, Scisense solid-state sensors are a user-friendly choice, as they do not require cumbersome and time-consuming flushing to remove air bubbles, nor do they involve a complicated system of tubing and stopcocks. Accuracy, reliability, and efficiency are Scisense advantages.
Explanation of graph (above):
Other Benefits to Scisense Solid-State Pressure Sensors:
Ease of use:
Calibration and balancing:
Summary of benefits: