Fiber Optic Micro-Catheter Pressure Transducers (FISO-LS Series)
Fiber optic blood pressure measurement system for measuring blood pressure in very small vessels, isolated hearts, etc. Pressure measurement occurs at the exact location of interest.
FISO–LS series pressure sensors were designed as semi-disposable for multi-use applications in the life-sciences and small animal research. Unlike its disposable counterpart in clinical applications, this sensor is more robust with a protected tip.
The FISO Series Signal Conditioners and EVO Chassis are required for the use of any of the FISO–LS series fiber optic sensors.
FISO Fiber Optic Temperature Sensors are also available.
FISO-LS series catheters were designed as semi-disposable for multi-use applications in the life sciences and small animal research. This is a robust sensor with a protected tip. The standard transducers have 1 meter of nylon sheathing to protect the fiber, where the 10 m transducers have 9.3 to 9.8 m of nylon sheath, further protecting the glass fiber. With proper use and care these sensors can be used many times.
All sensors are pre–calibrated at the factory and the transducer's calibration information is stored in a smart chip directly on the optical connector. The information is automatically read into the Evolution Software and downloaded to the FPI signal conditioner. No further recalibration is needed — simply zero the transducer.
- Low noise
- Accurate
- Sensor located at tip of fiber
- Easy to use
- Pre-calibrated sensors
The FISO Series Signal Conditioners and EVO Chassis are required for the use of any of the FISO–LS series fiber optic sensors.
Applications
- Neuroscience—intracranial pressure; blast wave and impact trauma
- Cardiovascular—left ventricular pressure; arterial or venous blood pressure
- Ocular Tonometry—non-invasive intracoular pressure tonometry
- Urology—bladder/ureter pressure
- Spine—intradiscal pressure
- Bone—intramedullary pressure
- MRI Gating—use the 10 m MRI sensor to measure pressure for gating
FISO Pressure Sensors
The FISO catheters utilize a Fabry-Pérot etalon which is comprised of two parallel reflecting mirrors on either side of a transparent medium, where the distance between the mirrors is known as the etalon cavity length. The transmission characteristic for the F-P etalon has distinct transmission peaks in wavelength as a function of the cavity length, physically corresponding to resonances of the etalon.
FISO’s pressure sensors are a flexible embodiment of the F-Petalon. A deformed membrane is assembled over a vacuumed cavity, thus forming a small drum-like structure. The sensing F-Pcavity is located between the base of the drum and the flexible membrane. When pressure is applied, the membrane is deflected toward the bottom of the drum, thus reducing cavity length. After appropriate sensor calibration, completed at the factory, each etalon cavity length corresponds to a specific pressure value. The signal conditioner is designed to determine the cavity length to the nanometer level, providing the researcher with an extremely accurate and repeatable pressure measurement system.
Modular Evolution Chassis
The EVO Chassis provides the power to the signal conditioner modules as well as the digital interface for data transfer between the signal conditioners and the Evolution Software. The EVO Chassis (2- and 5-channel version) includes the Power/Interface module, Evolution data acquisition and instrument control software, USB cable, power supply, and module removal tool. The Power Supply/Interface module has a USB2.0 output and includes the Evolution software. The 2–Channel chassis can house up to 2 FPI signal conditioning modules, while the 5–channel can house up to 5. Chassis do not need to be filled to capacity for use. Add more signal conditioners at any time up to the capacity of the chassis.
The data sampling rate of up to 15 kHz offers the ability to accurately detect fast–changing pressure signals, such as that from mouse heart. Visualize the dichrotic notch with ease! Data is either transferred into the computer via USB to the Evolution acquisition software (at up to 5 kHz) or via the analog output (up to 15 kHz) to an independent data acquisition system.
FISO Signal Conditioners
RS–232/RS–485 Digital Output onboard as well as a 0 to 5 V analog output. An analog output cable is supplied with a BNC connector to interface with common data acquistion systems. The FPI–HR series conditioners are compatible with the fiber optic temperature catheters. The FPI–LS series conditioners are compatible with the FISO–LS pressure catheters. The technique used internally to transmit and receive the light signal allows for continuous sensing that does not rely on light pulses. Since no light is pulsed there is no need for a minimum catheter length as with previous fiber optic sensors. A built–in fan keeps the signal conditioners from overheating or burning out the unit — no special foot stand required.
Catheter Extension Cable
Allows for the remote connection of the sensor 3 meters from the EVO Chassis/Signal Conditioner.
| Specifications | 75-0706 | 75-0707 | 75-0715 | 75-0716 | 75-0714 |
|---|---|---|---|---|---|
| Accuracy | 2 mmHg or better | 2 mmHg | 2 mmHg or better | 2 mmHg | 2 mmHg |
| Calibration | Factory Calibration no on site calibration needed | Factory Calibration no on site calibration needed | Factory Calibration no on site calibration needed | Factory Calibration no on site calibration needed | Factory Calibration no on site calibration needed |
| Coated Fiber Diameter | 300 µm | 640 µm | 300 µm | 640 µm | 640 µm |
| Coating | Polyimide, Nylon | Polyimide, Nylon | Polyimide, Nylon | Polyimide, Nylon | Polyimide, Nylon |
| Length | 1.2 meters | 1.7 meters | 10 meters | 10 meters | 1.7 meters |
| Measurement media | Fluid or gas | Fluid or gas | Fluid or gas | Fluid or gas | Fluid or gas |
| Pressure Range | ±300 mmHg | ±300 mmHg | ±300 mmHg | ±300 mmHg | 0 to 10 bar |
| Resolution | < 0.1 mmHg | < 0.3 mmHg | < 0.1 mmHg | < 0.3 mmHg | < 0.3 mmHg |
| Sensitivity Thermal Effect | < 0.04%/°C | < 0.05%/°C | < 0.04%/°C | < 0.05%/°C | < 0.05%/°C |
| Sensor Diameter | 300 µm | 640 µm | 300 µm | 640 µm | 640 µm |
| Standard bare fiber length | 20 cm | 70 cm | 20 cm | 70 cm | 70 cm |
| Storage temperature | –40–+80°C (–40–176°F) | –40–+80°C (–40–176°F) | –40–+80°C (–40–176°F) | –40–+80°C (–40–176°F) | –40–+80°C (–40–176°F) |
| Tolerated bend radius | 10 mm (0.4in) | 10 mm (0.4in) | 10 mm (0.4in) | 10 mm (0.4in) | 10 mm (0.4in) |
| Uncoated Fiber Diameter | 260 µm | 550 µm | 260 µm | 550 µm | 550 µm |
| Zero Thermal Effect | 0.2 mmHg*°C | 0.4 mmHg*°C | 0.2 mmHg*°C | 0.4 mmHg*°C | 0.4 mmHg*°C |